Looks like a cool new twist on a traditional bike. Like you said, might take a little while to get used to it, but might be a fun alternative 
Pros:
- It's like a tricycle for grown-ups 
- lightweight and easy to bring in your car trunk
- cool new alternative to traditional biking

Cons:
- Not sure how practical this is compared to regular biking

Overall, good find, this might be something to try out, not sure I would buy it though